The solar attentuation used to produce the expected solar radiation (which is used to calculate %sunshine) overdoes it for my elevation and climate, especially around 2-3 hours after sunrise and before sunset. My solar values are actually greater than the expected solar value (107% of expected sunshine) when the %sunshine should be in the 80-90% range given the conditions.
I'm at 775 meters elevation, and in a desert climate with frequent conditions of very dry clear air.
Could you give the option of modifying the attenuation constant (0.5 I think). I'd like to be able to set it lower, as low as 0.